This doesn’t strengthen the director’s hypothesis, as the argument is that the low audience turnout on the film’s opening weekend was only caused by competition from other films, and not by reviews. If anything, this might weaken by making the bad reviews more impactful.

This strengthens by affirming the assumption that filmgoers who saw a competing film would be less likely to see the director’s film. This makes it more reasonable to claim that competing films are the true explanation for the lower audience.

Even with a high total number of filmgoers on the opening weekend, the pool of viewers for films like the director’s could still be small, so this doesn’t clearly affect the argument.

Without knowing anything about the audience turnout for those other films relative to the director’s film, this doesn’t help us determine whether reviews are likely to have affected the turnout for the director’s film.

This is irrelevant, because we already know that only a small number of people like the kind of film made by the director, regardless of how they feel about other types of films.